Xu Yan is the tenth daughter of the Taoist family of Xu Chong, the magistrate of Luozhou, the capital of the Southern Kingdom. She grew up in a deep house. She was originally a lady, but her unexpected talent in solving cases attracted everyone's attention, and she was involved in various battles again and again. These battles may involve families or courts, ranging from the emperor, to the court, to the common people, and are complicated. Xu Yan was involved, and for various reasons, he had to use his knowledge of criminal analysis and criminal psychology to help solve the case. In the process of solving the case, Xu Yan and Yi Shenxing, the young leader of the nine gates in Beijing, gradually came together. Hou Yi Shenxing had no choice but to admit that he had killed many people and was willing to die. Xu Yan endured huge pressure to clear Yi Shenxing's grievances. Later, Yi Shenxing went on an expedition to his country and returned victorious, and the two finally got married.
